DAVID DUCROS / SCIENCE PHOTO LIBRARY DAVID DUCROS / SCIENCE PHOTO LIBRARY
Mars. Artwork of Mars, the fourth planet from the Sun and part of the inner solar system. Mars is a cold desert world, with an atmosphere of mostly carbon dioxide and an equatorial diameter of 6792 kilometres. Surface features include polar ice caps (northern one at top), highlands, lowlands, craters, and canyons. The largest canyon system is Valles Marineris (lower left).
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